Boom Lockout Device for Hydraulic Front Shovel Safety
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Solution Overview
Problem
Hydraulic front shovels face safety hazards when the boom drops due to weight, compromising bracing and posing a risk to nearby personnel, as existing safety devices lack the structural features to prevent rod retraction effectively.
Innovation Solution
A boom lockout device comprising two halves with flat ceilings and side walls, bolted together around the cylinder rod, featuring connection plates, support brackets, gussets, and spacers to form a solid brace preventing rod retraction into the barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the boom cylinder rod is allowed to retract fully under the weight of the boom, then the hydraulic system can be serviced and the boom can return to its operational position, but the stick may move forward causing the boom to drop creating an unsafe situation
Solution Approach 1:
The lockout device is installed on the boom cylinder rod before maintenance begins, preventing the rod from retracting during the maintenance period. This preliminary action eliminates the safety hazard by ensuring the boom remains supported even if the stick bracing is removed or compromised during servicing.
Solution Approach 2:
The lockout device acts as an intermediary mechanical element between the boom cylinder rod and the boom structure. It provides an alternative support path that bypasses the stick bracing system, transferring the load support function from the stick to the lockout device during maintenance operations.
2Object-affected harmful factors
If a mechanical stop is installed to prevent boom cylinder retraction, then safety is improved by preventing boom drop, but the device complexity increases
Solution Approach 1:
The lockout device is divided into two separate halves that can be independently installed and removed. Each half attaches to opposite sides of the boom cylinder rod, allowing the device to be segmented for easier installation and removal while providing complete circumferential support when assembled.
Solution Approach 2:
The lockout device halves are designed to fit around the existing boom cylinder rod structure, nesting the lockout mechanism within the spatial envelope already defined by the hydraulic cylinder assembly. This avoids adding external complexity while providing the necessary safety function.
3Ease of operation
If the lockout device uses a split half design, then ease of installation is improved, but the structural strength may be compromised compared to a solid structure
Solution Approach 1:
Connection plates and support brackets are pre-positioned and pre-bolted to the lockout device halves during manufacturing, creating a rigid assembled structure before installation. This preliminary assembly ensures that when the halves are bolted together on the boom, the internal structure is already optimized for strength.
Solution Approach 2:
The lockout device combines multiple structural elements (side walls, connection plates, support brackets, gussets) made from high-strength materials into a composite structure. The combination of these elements creates a rigid assembly that compensates for the split design, achieving strength equivalent to or greater than a solid structure while maintaining ease of installation.
Data Source
AI summary
A boom lockout device for use with a hydraulic front shovel comprising a first half and a second half, each of which comprises a flat ceiling and two flat side walls. The ceiling is situated between the two side walls and is joined to the two side walls along a longitudinal edge of the ceiling. The angle between the ceiling and each of the two side walls is approximately ninety degrees. The first half and the second half are bolted together around the cylinder rod. The boom lockout device is installed between the barrel and the mount of the boom cylinder to prevent the rod from retracting into the barrel.